by Travis » Thu Jan 08, 2004 1:15 am
[quote]Who says they are more advanced? Perhaps we haven't exchanged radio signals because they haven't been at the radio age yet.[quote]
Earth has undergone an incredible amount of change in its history. There have been something like seven massive extinctions (the most well-known being the dinosaurs) and numerous small extinctions. As a species on this planet, humans have come about very recently.
So if there is another planet out there that can support life, logically it will have evolved at least as much as us, and probably a lot more. IE, it might not have been decimated as badly, and so any species that was able to get a foothold would dominate the planet. If the dinos hadn't been wiped out, they would probably have evolved to be as intelligent as humans. And that was 65 million years ago.